linux-postmarketos-qcom-sdm845: Use llvm-strip for modules_install

I had originally overlooked that this was necessary. If
INSTALL_MOD_STRIP=1 is set when invoking modules_install, we need to set
LLVM=1 to ensure that llvm-strip is used instead of GNU binutils strip.

Signed-off-by: Jens Reidel <adrian@postmarketos.org>
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7358>

device/community/linux-postmarketos-qcom-sdm845/APKBUILD

@@ -6,7 +6,7 @@
 _flavor="postmarketos-qcom-sdm845"
 pkgname=linux-$_flavor
 pkgver=6.16.7
-pkgrel=2
+pkgrel=3
 pkgdesc="Mainline Kernel fork for SDM845 devices"
 arch="aarch64"
 _carch="arm64"
@@ -68,6 +68,7 @@ package() {
 
 	make modules_install dtbs_install \
 		ARCH="$_carch" \
+		LLVM=1 \
 		INSTALL_PATH="$pkgdir"/boot/ \
 		INSTALL_MOD_PATH="$pkgdir" \
 		INSTALL_MOD_STRIP=1 \