PMW3389 Revert Firmware load during Initilization (#15859)

drivers/sensors/pmw3389.c

@@ -210,16 +210,14 @@ void pmw3389_upload_firmware(void) {
     spi_write(REG_SROM_Load_Burst | 0x80);
     wait_us(15);
 
-#ifdef PMW3389_LEGACY_FIRMWARE_UPLOAD
+    // legacy only for PMW3389 spi_transmit failed to load firmware
     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);
 
     pmw3389_read(REG_SROM_ID);