wl18xx: add plt_init operation

Add the correct FW name for PLT (which is the same as the normal
firmware) and implement the plt_init operation.

Signed-off-by: Luciano Coelho <coelho@ti.com>
Signed-off-by: Arik Nemtsov <arik@wizery.com>
diff --git a/drivers/net/wireless/ti/wl18xx/reg.h b/drivers/net/wireless/ti/wl18xx/reg.h
index 1674c1a..aaedf91 100644
--- a/drivers/net/wireless/ti/wl18xx/reg.h
+++ b/drivers/net/wireless/ti/wl18xx/reg.h
@@ -154,6 +154,12 @@
  */
 #define WL18XX_INTR_TRIG_EVENT_ACK BIT(29)
 
+/*
+ * To boot the firmware in PLT mode we need to write this value in
+ * SCR_PAD8 before starting.
+ */
+#define WL18XX_SCR_PAD8_PLT	0xBABABEBE
+
 /* TODO: maybe move elsewhere? */
 #define NUM_OF_CHANNELS_11_ABG 150
 #define NUM_OF_CHANNELS_11_P 7