cbmem_top_chipset: Change the return value to uintptr_t

Get rid of a lot of casts.

Change-Id: I93645ef5dd270905ce421e68e342aff4c331eae6
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/69078
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jakub Czapiga <jacz@semihalf.com>

src/soc/intel/baytrail/memmap.c

@@ -16,9 +16,9 @@ static size_t smm_region_size(void)
 	return CONFIG_SMM_TSEG_SIZE;
 }
 
-void *cbmem_top_chipset(void)
+uintptr_t cbmem_top_chipset(void)
 {
-	return (void *) smm_region_start();
+	return smm_region_start();
 }
 
 void smm_region(uintptr_t *start, size_t *size)

src/soc/intel/braswell/memmap.c

@@ -19,7 +19,7 @@ void smm_region(uintptr_t *start, size_t *size)
 	*size = smm_region_size();
 }
 
-void *cbmem_top_chipset(void)
+uintptr_t cbmem_top_chipset(void)
 {
 	uintptr_t smm_base;
 	size_t smm_size;
@@ -53,5 +53,5 @@ void *cbmem_top_chipset(void)
 	*/
 
 	smm_region(&smm_base, &smm_size);
-	return (void *)smm_base;
+	return smm_base;
 }

src/soc/intel/broadwell/memmap.c

@@ -29,9 +29,9 @@ static uintptr_t dpr_region_start(void)
 	return tom;
 }
 
-void *cbmem_top_chipset(void)
+uintptr_t cbmem_top_chipset(void)
 {
-	return (void *) dpr_region_start();
+	return dpr_region_start();
 }
 
 void smm_region(uintptr_t *start, size_t *size)