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/drivers/amd/agesa/romstage.c

@@ -93,8 +93,8 @@ static void ap_romstage_main(void)
 	halt();
 }
 
-void *cbmem_top_chipset(void)
+uintptr_t cbmem_top_chipset(void)
 {
 	/* Top of CBMEM is at highest usable DRAM address below 4GiB. */
-	return (void *)restore_top_of_low_cacheable();
+	return restore_top_of_low_cacheable();
 }

src/drivers/intel/fsp2_0/cbmem.c

@@ -3,10 +3,10 @@
 #include <cbmem.h>
 #include <fsp/util.h>
 
-void *cbmem_top_chipset(void)
+uintptr_t cbmem_top_chipset(void)
 {
 	struct range_entry tolum;
 
 	fsp_find_bootloader_tolum(&tolum);
-	return (void *)(uintptr_t)range_entry_end(&tolum);
+	return range_entry_end(&tolum);
 }