amd/agesa/s3_resume: Make compiler agnostic.

Clang does not like inline functions defined in C files with prototypes
in headers. Rather Clang expects inline function bodies to be in headers
if they are to be used out of scope. Since inline is purely advisory to
the compiler, drop its usage here.

Change-Id: I08a7a3d2cdf841ffbab10c017c75917768aac209
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/5429
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Tested-by: build bot (Jenkins)

src/cpu/amd/agesa/s3_resume.c

@@ -103,7 +103,7 @@ void restore_mtrr(void)
 	wrmsr(SYS_CFG, msr_data);
 }
 
-inline void *backup_resume(void)
+void *backup_resume(void)
 {
 	void *resume_backup_memory;