linux-postmarketos-allwinner: enable CONFIG_UDMABUF (MR 5585)

As this is deemed the better option for the libcamera softwareISP.
Also disable CMA allocations. They can still be enabled via kernel
command line for testing/debugging purposes, but we don't need to
reserve memory for it unconditionally.

[ci:skip-build]: already built successfully in CI

device/main/linux-postmarketos-allwinner/APKBUILD

@@ -4,7 +4,7 @@ _flavor=postmarketos-allwinner
 _config="config-$_flavor.$CARCH"
 pkgname=linux-$_flavor
 pkgver=6.9.10_git20240721
-pkgrel=2
+pkgrel=3
 _tag="orange-pi-6.9-20240721-2345"
 pkgdesc="Kernel fork with Pine64 patches (megi's tree, slightly patched)"
 arch="aarch64 armv7"
@@ -79,10 +79,9 @@ package() {
 		INSTALL_MOD_PATH="$pkgdir" \
 		INSTALL_DTBS_PATH="$pkgdir/boot/dtbs"
 }
-
 sha512sums="
 c6081383741fe883d8f6e223caa45d7ecf179f4cd0c759432bbbb2e43603088840393a0cf58735ab5dda4dbf5e2655d8c9b053a74b029ac4768c200ff6ca6f65  linux-postmarketos-allwinner-orange-pi-6.9-20240721-2345.tar.gz
-5e76989b32556a814c2daf45276bcfc2c606c962d0213f241bf56e2b670c8e99e3b3d6da4c6166147f03eafb8fa80efe62db802480d722aaee3669e7f5eb94dd  config-postmarketos-allwinner.aarch64
+64bdf137cbd07a8a4c669a77dffe2097b70ef0f7bafeae41d9bd3bd931fe14f7b8bd10bbac6ba83b59dc0375cfc89bcd9511200c1918d11c7dbeec47b96442dc  config-postmarketos-allwinner.aarch64
 ab8e5c5ddd95a8317a98fab5db99be4b0c308c1e0793099ca8ec0721177689565288102471bd2840f5163231bd96b8ed06eeacdb21c8dbba0726360d6554210d  config-postmarketos-allwinner.armv7
 a1fe1a21c34062eb92b6a4a9d2ef330d0e745859af283ccf05fc899ec263f9d452c1399c29620a0e4c748eca4b0c13645668b2fc0dc72f5703426d472f1294be  0001-dts-add-dontbeevil-pinephone-devkit.patch
 0ef26b34fa834c119ebff6daa27b1dd3fac27448d6a40c0b2022a00c239dad0ef3e2b3ab3f9eec5460f921c9c6ea21db360adc175a7e658d5c34c5d0aacc498f  0002-dts-add-pinetab-dev-old-display-panel.patch

device/main/linux-postmarketos-allwinner/config-postmarketos-allwinner.aarch64

@@ -4971,7 +4971,7 @@ CONFIG_PL330_DMA=y
 #
 CONFIG_SYNC_FILE=y
 # CONFIG_SW_SYNC is not set
-# CONFIG_UDMABUF is not set
+CONFIG_UDMABUF=y
 # CONFIG_DMABUF_MOVE_NOTIFY is not set
 # CONFIG_DMABUF_DEBUG is not set
 # CONFIG_DMABUF_SELFTESTS is not set
@@ -6581,7 +6581,7 @@ CONFIG_DMA_CMA=y
 #
 # Default contiguous memory area size:
 #
-CONFIG_CMA_SIZE_MBYTES=256
+CONFIG_CMA_SIZE_MBYTES=0
 CONFIG_CMA_SIZE_SEL_MBYTES=y
 # CONFIG_CMA_SIZE_SEL_PERCENTAGE is not set
 # CONFIG_CMA_SIZE_SEL_MIN is not set