rsi: use subdirectory for firmware file

linux-firmware maintainers prefer to have a subdirectory for
firmware files. Code is changed here to pick firmware file from
a subdirectory. Firmware file with a new loading mechanism will
be submitted inside rsi directory.
Signed-off-by: Amitkumar Karwar <amit.karwar@redpinesignals.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/rsi/rsi_91x_hal.c

@@ -22,7 +22,7 @@
 /* FLASH Firmware */
 static struct ta_metadata metadata_flash_content[] = {
 	{"flash_content", 0x00010000},
-	{"rs9113_wlan_qspi.rps", 0x00010000},
+	{"rsi/rs9113_wlan_qspi.rps", 0x00010000},
 };
 
 /**