Fix flash/monitoring of 26mhz targets #494

Job	Run time
Check lib (x86_64-unknown-linux-gnu)	25s
Check (x86_64-apple-darwin)	1m 12s
Check lib (aarch64-unknown-linux-gnu)	2m 25s
Check (x86_64-unknown-linux-gnu)	24s
Clippy (x86_64-unknown-linux-gnu)	32s
Check lib (armv7-unknown-linux-gnueabihf)	2m 46s
Clippy (aarch64-unknown-linux-gnu)	1m 51s
Check (x86_64-unknown-linux-musl)	1m 0s
Clippy (armv7-unknown-linux-gnueabihf)	1m 53s
Check (x86_64-pc-windows-msvc)	3m 47s
Check MSRV (x86_64-unknown-linux-gnu)	44s
Check (aarch64-unknown-linux-gnu)	2m 40s
Rustfmt	13s
Check MSRV (aarch64-unknown-linux-gnu)	1m 42s
Check (armv7-unknown-linux-gnueabihf)	1m 28s
Check MSRV (armv7-unknown-linux-gnueabihf)	2m 12s
Unit Tests (x86_64-unknown-linux-gnu)	27s
Unit Tests (aarch64-unknown-linux-gnu)	1m 50s
Unit Tests (armv7-unknown-linux-gnueabihf)	2m 10s
	29m 41s

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