cpu/amd/fam10/ram_calc: Remove superfluous guard

AMD_FAM10H code enables early cbmem by default.

Change-Id: Ifad007f6604bb612d544cf1387938a8fef1cceb4
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/20148
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Philippe Mathieu-Daudé <philippe.mathieu.daude@gmail.com>

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

@@ -26,7 +26,6 @@
 
 #include "ram_calc.h"
 
-#if !IS_ENABLED(CONFIG_LATE_CBMEM_INIT)
 static inline uint8_t is_fam15h(void)
 {
 	uint8_t fam15h = 0;
@@ -96,4 +95,3 @@ void *cbmem_top(void)
 
 	return (void *) topmem - get_uma_memory_size(topmem) - get_cc6_memory_size();
 }
-#endif