[POWERPC] Fix is_power_of_4(x) compile error

When building an 85xx kernel we get:

  CC      arch/powerpc/mm/pgtable_32.o
arch/powerpc/mm/pgtable_32.c: In function 'io_block_mapping':
arch/powerpc/mm/pgtable_32.c:330: error: expected identifier before '(' token
arch/powerpc/mm/pgtable_32.c:330: error: expected statement before ')' token

The is_power_of_2(x) fixup patch left an extra ')' on the is_power_of_4 macro.
There is a similiar issue on the arch/ppc side.
Signed-off-by: NKumar Gala <galak@kernel.crashing.org>

arch/powerpc/mm/pgtable_32.c

@@ -295,7 +295,7 @@ void __init mapin_ram(void)
 }
 
 /* is x a power of 4? */
-#define is_power_of_4(x)	is_power_of_2(x) && (ffs(x) & 1))
+#define is_power_of_4(x)	is_power_of_2(x) && (ffs(x) & 1)
 
 /*
  * Set up a mapping for a block of I/O.

arch/ppc/mm/pgtable.c

@@ -314,7 +314,7 @@ void __init mapin_ram(void)
 }
 
 /* is x a power of 4? */
-#define is_power_of_4(x)	is_power_of_2(x) && (ffs(x) & 1))
+#define is_power_of_4(x)	is_power_of_2(x) && (ffs(x) & 1)
 
 /*
  * Set up a mapping for a block of I/O.