Add extra NVIC_ISER registers

teensy3/kinetis.h

 
 #define NVIC_ISER0		(*(volatile uint32_t *)0xE000E100)
 #define NVIC_ISER1		(*(volatile uint32_t *)0xE000E104)
+#define NVIC_ISER2		(*(volatile uint32_t *)0xE000E108)
+#define NVIC_ISER3		(*(volatile uint32_t *)0xE000E10C)
 #define NVIC_ICER0		(*(volatile uint32_t *)0xE000E180)
 #define NVIC_ICER1		(*(volatile uint32_t *)0xE000E184)
+#define NVIC_ICER2		(*(volatile uint32_t *)0xE000E188)
+#define NVIC_ICER3		(*(volatile uint32_t *)0xE000E18C)
 
 // 0 = highest priority
 // Cortex-M4: 0,16,32,48,64,80,96,112,128,144,160,176,192,208,224,240