MindSensors PSP-Nx button set 1 constants

PSP_BTNSET1_DOWN PSP_BTNSET1_L3 PSP_BTNSET1_LEFT PSP_BTNSET1_R3 PSP_BTNSET1_RIGHT PSP_BTNSET1_SELECT PSP_BTNSET1_START PSP_BTNSET1_UP

#define PSP_BTNSET1_R3   0x04 The PSP-Nx button set 1 R3