mpc8xxx: fsl_pamu: Update data type in config_pamu

Update data type of '1' to '1ull' in below assignment
size = 1ull << sizebit;

to fix incorrect assignment issue.
e.g: when sizebit was 31, 0x80000000 got sign extended to
0xffffffff_80000000

Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
Reported-by: Dean Saridakis <dean.saridakis@baesystems.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/arch/powerpc/cpu/mpc8xxx/fsl_pamu.c b/arch/powerpc/cpu/mpc8xxx/fsl_pamu.c
index 2c378b7..5229949 100644
--- a/arch/powerpc/cpu/mpc8xxx/fsl_pamu.c
+++ b/arch/powerpc/cpu/mpc8xxx/fsl_pamu.c
@@ -390,7 +390,7 @@
 		return -1;
 
 	sizebit = __ilog2_roundup_64(size);
-	size = 1 << sizebit;
+	size = 1ull << sizebit;
 	debug("min start_addr is %llx\n", min_addr);
 	debug("max end_addr is %llx\n", max_addr);
 	debug("size found is  %llx\n", size);