linux-postmarketos-qcom-sdm660: upgrade to 6.11.1

This release has several little but neat fixes not really worth mentioning, but most notable features are:

• Xiaomi Mi PAD 4 and PLUS (clover) both variants now have proper panel driver and full GPU support. On par with other our devices now. Thanks to @kubntd for code and @barni2000 for testing !
• ath10k wlan no-msa-indication hack was dropped in favor of solution that was accepted upstream.
• Adreno 5xx preemption fixes were also included, thx @junak ( / @kanuj / @vladly ?)

device/testing/linux-postmarketos-qcom-sdm660/APKBUILD

@@ -4,7 +4,7 @@
 _flavor="postmarketos-qcom-sdm660"
 pkgname=linux-$_flavor
 pkgver=6.11.1
-pkgrel=1
+pkgrel=0
 pkgdesc="Close to mainline linux kernel for Qualcomm Snapdragon 660 SoC"
 arch="aarch64"
 url="https://kernel.org/"
@@ -44,6 +44,9 @@ prepare() {
 }
 
 build() {
+	echo ">>> Debug gcc: ${CC}"
+	gcc -v
+	${CC} -v
 	unset LDFLAGS
 	make ARCH="$_carch" CC="${CC:-gcc}" \
 		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-$_flavor"