qcacld-3.0: Add feature flag for pcie reg window no cache

Add feature flag PCIE_REG_WINDOW_LOCAL_NO_CACHE to support no
caching of PCIE register window value in driver.

Change-Id: I427b784de874464b98a2acf67b9850e1e41f65aa
CRs-Fixed: 2487158

Kbuild

@@ -2775,6 +2775,7 @@ endif
 
 cppflags-y += -DFEATURE_NBUFF_REPLENISH_TIMER
 cppflags-y += -DPEER_CACHE_RX_PKTS
+cppflags-y += -DPCIE_REG_WINDOW_LOCAL_NO_CACHE
 
 ccflags-$(CONFIG_HASTINGS_BT_WAR) += -DHASTINGS_BT_WAR