defconfig/rpi: bump kernel for misc fixes

Bump for a few fixes:
  - fix for slow SDcards
  - fix for USB interrupts
  - fix for tracing functions

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

configs/rpi_defconfig

@@ -17,7 +17,7 @@ BR2_DEFAULT_KERNEL_VERSION="3.6.11"
 BR2_LINUX_KERNEL=y
 BR2_LINUX_KERNEL_CUSTOM_GIT=y
 BR2_LINUX_KERNEL_CUSTOM_GIT_REPO_URL="git://github.com/raspberrypi/linux.git"
-BR2_LINUX_KERNEL_CUSTOM_GIT_VERSION="53f7e0b"
+BR2_LINUX_KERNEL_CUSTOM_GIT_VERSION="0006326"
 BR2_LINUX_KERNEL_USE_DEFCONFIG=y
 BR2_LINUX_KERNEL_DEFCONFIG="bcmrpi"
 BR2_LINUX_KERNEL_ZIMAGE=y