gnu: linux-libre-5.4-source: Add patch to support pinebook pro.

* gnu/packages/patches/linux-libre-support-for-Pinebook-Pro.patch:
  New file.
* gnu/local.mk (dist_patch_DATA): Update accordingly.
* gnu/packages/linux (linux-libre-5.4-source): Add patch.

gnu/local.mk

@@ -1159,6 +1159,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/lierolibre-remove-arch-warning.patch	\
   %D%/packages/patches/lierolibre-try-building-other-arch.patch	\
   %D%/packages/patches/linkchecker-tests-require-network.patch	\
+  %D%/packages/patches/linux-libre-support-for-Pinebook-Pro.patch \
   %D%/packages/patches/linux-pam-no-setfsuid.patch		\
   %D%/packages/patches/lirc-localstatedir.patch			\
   %D%/packages/patches/lirc-reproducible-build.patch		\

gnu/packages/linux.scm

@@ -433,7 +433,11 @@ corresponding UPSTREAM-SOURCE (an origin), using the given DEBLOB-SCRIPTS."
 (define-public linux-libre-5.4-source
   (source-with-patches linux-libre-5.4-pristine-source
                        (list %boot-logo-patch
-                             %linux-libre-arm-export-__sync_icache_dcache-patch)))
+                             %linux-libre-arm-export-__sync_icache_dcache-patch
+                             ;; Pinebook Pro patch from linux-next,
+                             ;; can be dropped for linux-libre 5.7
+                             (search-patch
+                              "linux-libre-support-for-Pinebook-Pro.patch"))))
 
 (define-public linux-libre-4.19-source
   (source-with-patches linux-libre-4.19-pristine-source