[AVR32] Add missing bit in PCCR sysreg

The enable bit was missing...
Signed-off-by: NHaavard Skinnemoen <hskinnemoen@atmel.com>

include/asm-avr32/sysreg.h

@@ -215,6 +215,8 @@
 #define SYSREG_IRP_SIZE				6
 
 /* Bitfields in PCCR */
+#define SYSREG_PCCR_E_OFFSET			0
+#define SYSREG_PCCR_E_SIZE			1
 #define SYSREG_PCCR_R_OFFSET			1
 #define SYSREG_PCCR_R_SIZE			1
 #define SYSREG_PCCR_C_OFFSET			2