[rdkb][common][bsp][Refactor BB file for kirkstone build pass]

[Description]
Refactor BB file for kirkstone build pass

[Release-log]

Change-Id: I82abe730b8b4324db279af33aa4f68397383feb5
diff --git a/recipes-wifi/linux-mt76/linux-mt76_3.x.bb b/recipes-wifi/linux-mt76/linux-mt76_3.x.bb
index b9a69c7..b8ccb5f 100644
--- a/recipes-wifi/linux-mt76/linux-mt76_3.x.bb
+++ b/recipes-wifi/linux-mt76/linux-mt76_3.x.bb
@@ -7,7 +7,7 @@
 
 require mt76.inc
 SRC_URI = " \
-    git://git@github.com/openwrt/mt76.git;protocol=https \
+    git://git@github.com/openwrt/mt76.git;protocol=https;branch=master \
     file://COPYING;subdir=git \
     "
 SRC_URI += " \
@@ -69,8 +69,6 @@
 do_install() {
     # Module
     install -d ${D}/lib/modules/${KERNEL_VERSION}/updates/drivers/net/wireless/mediatek/mt76/
-    install -d ${D}/lib/modules/${KERNEL_VERSION}/updates/drivers/net/wireless/mediatek/mt76/mt7615/
-    install -d ${D}/lib/modules/${KERNEL_VERSION}/updates/drivers/net/wireless/mediatek/mt76/mt7915/
     install -m 0644 ${B}/mt76.ko ${D}/lib/modules/${KERNEL_VERSION}/updates/drivers/net/wireless/mediatek/mt76/
     install -m 0644 ${B}/mt76-connac-lib.ko ${D}/lib/modules/${KERNEL_VERSION}/updates/drivers/net/wireless/mediatek/mt76/
     install -m 0644 ${B}/mt7996/mt7996e.ko ${D}/lib/modules/${KERNEL_VERSION}/updates/drivers/net/wireless/mediatek/mt76/