PMA, MMU: Fix bug of PA48

[good-circle]

*PMA: Extend the default memory space from 0x1000000000L to 0x1000000000000L
*MMU: only trigger accessfault when ppn above PADDRBITS(48)-OFFSETBITS(12) is not zero

[cebarobot]

LGTM

[XiangShanRobot]

[Generated by IPC robot]
commit: a15c504

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
a15c504	1.824	0.458	2.000	1.198	2.824	2.481	2.363	0.960	1.409	1.408	3.357	2.512	2.422	2.994

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
002c10a	1.802	0.458	2.000	1.198	2.824	2.481	2.364	0.960	1.409	1.408	3.357	2.512	2.422	2.994
135df6a	1.823	0.458	2.000	1.198	2.824	2.481	2.364	0.960	1.409	1.408	3.357	2.512	2.422	2.994
3f525d7	1.824	0.458	2.002	1.198	2.824	2.481	2.364	0.960	1.409	1.408	3.357	2.512	2.422	2.994
a4f8608	1.808	0.458	2.000	1.198	2.824	2.481	2.364	0.960	1.409	1.408	3.357	2.512	2.422	2.994
49162c9	1.808	0.458	1.997	1.198	2.824	2.481	2.364	0.960	1.409	1.408	3.357	2.512	2.422	2.994
9792966	1.824	0.458	1.992	1.197	2.840	2.484	2.364	0.952	1.405	1.408	3.352	2.513	2.425	2.994
fc90f6e	1.822	0.458	1.992	1.197	2.840	2.484	2.364	0.952	1.405	1.408	3.352	2.513	2.425	2.994
33a531f	1.822	0.458	1.992	1.197	2.840	2.484	2.364	0.952	1.405	1.408	3.352	2.513	2.425	2.994
7e0f64b	1.824	0.458	1.992	1.197	2.840	2.484	2.364	0.952	1.405	1.408	3.352	2.513	2.425	2.994
0b62a2f	1.824	0.458	1.992	1.197	2.840	2.484	2.364	0.952	1.405	1.408	3.352	2.513	2.425	2.994