dt_makefile_patcher: fix dtbs with dot in filename

[amazingfate]

Description

We do not build dtbs with dot in filename because the current re match rule will ignore them.
This fixes #7187

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

• ./compile.sh kernel-dtb BOARD=orangepi3b BRANCH=vendor DEB_COMPRESS=xz KERNEL_CONFIGURE=no KERNEL_GIT=shallow with kernel https://github.com/dust-7/linux-rockchip/tree/opi3b-v2, rk3566-orangepi-3b-v1.1.dtb and rk3566-orangepi-3b-v1.1.dtb are built.

Checklist:

Please delete options that are not relevant.

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules

[rpardini]

I can't grok regular expressions (even the ones I wrote lol), so I asked an LLM, and it said it's fine ✅

---

The difference between the two regular expressions lies in how they define the part that captures the filename (before the .dtb extension) and how they handle special characters.

1. regex_dtb = r"(.)\s(([a-zA-Z0-9-]+).dtb)(.)"
   (.*): This captures any character (except newline) zero or more times before the space.
   \s: This matches any whitespace character (space, tab, etc.).
   ([a-zA-Z0-9-]+): This captures one or more occurrences of any alphanumeric character (a-z, A-Z, 0-9), hyphen (-), or underscore (_).
   .dtb: This matches the .dtb extension.
   (.*): This captures any character zero or more times after the .dtb.
   This regular expression is designed to match filenames that only contain alphanumeric characters, hyphens, and underscores before the .dtb extension.

2. regex_dtb = r"(.)\s(([^ \f\n\r\t\v]+).dtb)(.)"
   (.): Same as before, it captures any character zero or more times before the space.
   \s: This matches any whitespace character.
   ([^ \f\n\r\t\v]+): This captures one or more characters that are not whitespace characters (spaces, form feeds, newlines, carriage returns, tabs, and vertical tabs).
   .dtb: This matches the .dtb extension.
   (.): This captures any character zero or more times after the .dtb.
   This version is more flexible, as it allows for any character that is not a whitespace character before the .dtb extension, rather than restricting it to alphanumeric characters, hyphens, or underscores. It will capture filenames with special characters like @, #, $, etc., as long as they are not whitespace.