Enhanced regulatory domain support

Following are the high-level changes in this feature:

1) Reduce the number of regulatory domains that are available from 9 to 4.
That is, only 4 out of the 9 regulatory domains in the NV.bin file would
be used and supported.

2) Add compulsory linux regulatory support to the wlan driver. The
support is added under the flag CONFIG_ENABLE_LINUX_REG.

3) Remove the WCNSS_qcom_cfg.ini item gCRDADefaultCountryCode

Change-Id: I5eef8ca53aafad69044d5468b50a3d266ee8ac1c
CRs-fixed: 538940
diff --git a/Kconfig b/Kconfig
index f0fde2b..d3f811b 100644
--- a/Kconfig
+++ b/Kconfig
@@ -45,4 +45,8 @@
 	bool "Enable Fast Transition (11r) feature"
 	default n
 
+config CONFIG_ENABLE_LINUX_REG
+	bool "Enable linux regulatory feature"
+	default n
+
 endif # PRIMA_WLAN || PRONTO_WLAN