sb/amd/sb700: Drop support

Relocatable ramstage, postcar stage and C_ENVIRONMENT_BOOTBLOCK are
now mandatory features, which platforms using this code lack.

Change-Id: Iffa4f54b2d1b43b6710447e69061c6ed433bff1d
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/36967
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/cpu/amd/family_10h-family_15h/init_cpus.c

@@ -30,10 +30,6 @@
 
 #include <southbridge/amd/common/reset.h>
 
-#if CONFIG(SOUTHBRIDGE_AMD_SB700)
-#include <southbridge/amd/sb700/sb700.h>
-#endif
-
 #if CONFIG(SOUTHBRIDGE_AMD_SB800)
 #include <southbridge/amd/sb800/sb800.h>
 #endif
@@ -1045,7 +1041,7 @@ void cpuSetAMDMSR(uint8_t node_id)
 		}
 	}
 
-#if CONFIG(SOUTHBRIDGE_AMD_SB700) || CONFIG(SOUTHBRIDGE_AMD_SB800)
+#if CONFIG(SOUTHBRIDGE_AMD_SB800)
 	if (revision & (AMD_DR_GT_D0 | AMD_FAM15_ALL)) {
 		/* Set up message triggered C1E */
 		msr = rdmsr(MSR_INTPEND);