CBMEM: Do not use get_top_of_ram() with DYNAMIC_CBMEM

The name was always obscure and confusing. Instead define cbmem_top()
directly in the chipset code for x86 like on ARMs.

TODO: Check TSEG alignment, it used for MTRR programming.

Change-Id: Ibbe5f05ab9c7d87d09caa673766cd17d192cd045
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/7888
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/include/cbmem.h

@@ -190,6 +190,8 @@ void backup_top_of_ram(uint64_t ramtop);
 void cbmem_late_set_table(uint64_t base, uint64_t size);
 #endif
 
+unsigned long get_top_of_ram(void);
+
 void get_cbmem_table(uint64_t *base, uint64_t *size);
 struct cbmem_entry *get_cbmem_toc(void);
 
@@ -201,8 +203,6 @@ static inline const struct cbmem_entry *cbmem_entry_find(uint32_t id)
 
 /* Common API between cbmem and dynamic cbmem. */
 
-unsigned long get_top_of_ram(void);
-
 /* Returns 0 if old cbmem was recovered. Recovery is only attempted if
  * s3resume is non-zero. */
 int cbmem_recovery(int s3resume);