Optimize initialization of PMW3360 Sensor (#15821)

drivers/sensors/pmw3360.c

@@ -209,12 +209,16 @@ void pmw3360_upload_firmware(void) {
     spi_write(REG_SROM_Load_Burst | 0x80);
     wait_us(15);
 
+#ifdef PMW3360_LEGACY_FIRMWARE_UPLOAD
     unsigned char c;
     for (int i = 0; i < FIRMWARE_LENGTH; i++) {
         c = (unsigned char)pgm_read_byte(firmware_data + i);
         spi_write(c);
         wait_us(15);
     }
+#else
+    spi_transmit(firmware_data, sizeof(firmware_data));
+#endif
     wait_us(200);
 
     pmw3360_read(REG_SROM_ID);