drivers/smmstore/ramstage: use call_smm

Use call_smm instead of open-coding the same in inline assembly
functionality in init_store. The local ebx variable is dropped, since
call_smm takes a pointer to the argument instead of an integer, and the
local eax variable is renamed to res to make the code a bit clearer,
since the EAX register is used for both passing the command and
subcommand to the APMC SMI handler and to get the return value from the
handler.

TEST=SMMSTORE V2 still works with the EDK2 payload on Careena

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: Ib14de0d120ae5c7db3bb7a529837ababe653e1a2
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79766
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>

0 files changed, 0 insertions, 0 deletions