configs: bump kernel used for the RPi

Fixes some USB-related bugs.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

configs/raspberrypi_defconfig

@@ -16,7 +16,7 @@ BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_3_12=y
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_GIT=y
 BR2_LINUX_KERNEL_CUSTOM_REPO_URL="git://github.com/raspberrypi/linux.git"
-BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="81bd944c02f65f706ad257f113fd5b2f62cdd03f"
+BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="b09a27249d61475e4423607f7632a5aa6e7b3a53"
 BR2_LINUX_KERNEL_USE_DEFCONFIG=y
 BR2_LINUX_KERNEL_DEFCONFIG="bcmrpi_quick"
 BR2_LINUX_KERNEL_ZIMAGE=y