ath6kl: read reserved ram size from firmware file

A new version of firmware needs different reserved ram size so read that
from the firmware image.

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
diff --git a/drivers/net/wireless/ath/ath6kl/init.c b/drivers/net/wireless/ath/ath6kl/init.c
index 5865466..e2a29b2 100644
--- a/drivers/net/wireless/ath/ath6kl/init.c
+++ b/drivers/net/wireless/ath/ath6kl/init.c
@@ -902,6 +902,7 @@
 	const char *filename;
 	const u8 *data;
 	int ret, ie_id;
+	__le32 *val;
 
 	switch (ar->version.target_ver) {
 	case AR6003_REV2_VERSION:
@@ -987,6 +988,10 @@
 
 			ar->fw_patch_len = ie_len;
 			break;
+		case ATH6KL_FW_IE_RESERVED_RAM_SIZE:
+			val = (__le32 *) data;
+			ar->hw.reserved_ram_size = le32_to_cpup(val);
+			break;
 		default:
 			ath6kl_dbg(ATH6KL_DBG_TRC, "Unknown fw ie: %u\n",
 				   le32_to_cpup(&hdr->id));