Copy the `is_descriptor_writeable()` function from the `intel/adlrvp`
mainboard and use it in the `configure_pmc_descriptor()` function. With
this change, this function is now identical for both mainboards.
Change-Id: I2ff39682ed98c6b8bc60cc2218f36f4934b9903c
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60939
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Sheng Lean Tan <sheng.tan@9elements.com>