qcacld-3.0: Define DBR_MULTI_SRNG_ENABLE if platform isn't Moselle

DBR_MULTI_SRNG_ENABLE is used to init DBR for both bands of DBS chip.
Some pltforms won't set CONFIG_CNSS_QCA6750 to n if chip isn't
Moselle. This change defines DBR_MULTI_SRNG_ENABLE if
CONFIG_CNSS_QCA6750 isn't equal to y.

Change-Id: I0cf726b542196c57d90cf38ec0db0f4ab38d3358
CRs-Fixed: 2759775

Kbuild

@@ -2546,7 +2546,7 @@ cppflags-$(CONFIG_WLAN_ENH_CFR_ENABLE) += -DWLAN_ENH_CFR_ENABLE
 cppflags-$(CONFIG_WLAN_CFR_ENABLE) += -DCFR_USE_FIXED_FOLDER
 cppflags-$(CONFIG_DIRECT_BUF_RX_ENABLE) += -DDIRECT_BUF_RX_ENABLE
 cppflags-$(CONFIG_WMI_DBR_SUPPORT) += -DWMI_DBR_SUPPORT
-ifeq ($(CONFIG_CNSS_QCA6750), n)
+ifneq ($(CONFIG_CNSS_QCA6750), y)
 cppflags-$(CONFIG_DIRECT_BUF_RX_ENABLE) += -DDBR_MULTI_SRNG_ENABLE
 endif
 cppflags-$(CONFIG_WMI_CMD_STRINGS) += -DWMI_CMD_STRINGS