configs: add Raspberry Pi 2 defconfig

Signed-off-by: James Hebden <james@hebden.net.au>
[yann.morin.1998@free.fr: fix commit log; further bump]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: "Guillermo A. Amaral" <g@maral.me>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

configs/raspberrypi2_defconfig

@@ -0,0 +1,15 @@
+BR2_arm=y
+BR2_cortex_a7=y
+BR2_ARM_EABIHF=y
+BR2_ARM_FPU_NEON_VFPV4=y
+BR2_TOOLCHAIN_BUILDROOT_LARGEFILE=y
+BR2_TOOLCHAIN_BUILDROOT_CXX=y
+BR2_TARGET_GENERIC_GETTY_PORT="tty1"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_GIT=y
+BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/raspberrypi/linux.git"
+BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="3c9fd364bfa6c0f6ef725d74b72a9b77dd0d0fb4"
+BR2_LINUX_KERNEL_DEFCONFIG="bcm2709"
+BR2_LINUX_KERNEL_ZIMAGE=y
+BR2_PACKAGE_RPI_FIRMWARE=y
+BR2_PACKAGE_RPI_FIRMWARE_INSTALL_DTBS=y