arch/risc/mcall.h: Make the stack pointer global

Clang complains about the stack pointer register variable being
uninitialized. This can remediated by making the variable global. Change
the variable name to be more unambiguous.

Change-Id: I24602372833aa9d413bf396853b223263fd873ed
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74570
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Daniel Maslowski <info@orangecms.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions