cpu/amd/mtrr: Remove topmem global variables

The comments are not correct anymore. With AGESA there is no need to
synchronize TOM_MEMx msr's between AP's. It's also not the best place
to do so anyway.

Change-Id: Iecbe1553035680b7c3780338070b852606d74d15
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/58693
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/include/cpu/amd/mtrr.h

@@ -66,10 +66,16 @@ static __always_inline void wrmsr_amd(unsigned int index, msr_t msr)
 		);
 }
 
-/* To distribute topmem MSRs to APs. */
-void setup_bsp_ramtop(void);
-uint64_t bsp_topmem(void);
-uint64_t bsp_topmem2(void);
+static inline uint64_t amd_topmem(void)
+{
+	return rdmsr(TOP_MEM).lo;
+}
+
+static inline uint64_t amd_topmem2(void)
+{
+	msr_t msr = rdmsr(TOP_MEM2);
+	return (uint64_t)msr.hi << 32 | msr.lo;
+}
 #endif
 
 #endif /* CPU_AMD_MTRR_H */