This patch adds support for -mcpu=gb10 (NVIDIA GB10). This is a
big.LITTLE cluster of Cortex-X925 and Cortex-A725 cores. The appropriate
MIDR numbers are added to detect them in -mcpu=native.
We did not add an -mcpu=cortex-x925.cortex-a725 option because GB10 does
include the crypto instructions which we want on by default, and the
current convention is to not enable such extensions for Arm Cortex cores
in -mcpu where they are optional in the IP.
Relevant GCC patch:
https://gcc.gnu.org/pipermail/gcc-patches/2025-June/687005.html
84e54515bc