qcacld-3.0: Enable delay reg write feature

Delay reg write is not enabled on Waipio,
but it's enabled on former platforms.
Change is to enable it.

Change-Id: I10b5e30fe4d5485d38636fcb34c90ff2772e50ae
CRs-Fixed: 3015389

configs/default_defconfig

@@ -600,6 +600,7 @@ endif
 ifeq ($(CONFIG_CNSS_QCA6490), y)
 	CONFIG_QCA6490_HEADERS_DEF := y
 	CONFIG_QCA_WIFI_QCA6490 := y
+	CONFIG_FEATURE_HAL_DELAYED_REG_WRITE := y
 endif
 
 ifeq ($(CONFIG_CNSS_QCA6750), y)