Remove CONFIG_XYZ_BUILTIN configurations, replace with the single CONFIG_NSH_BUILTIN_APPS. Add SAM3/4 sam_periphclks.h which is just a header file that includes the right header file. Misc SAM3U-EK cleanup

configs/stm3240g-eval/nxwm/defconfig

@@ -741,7 +741,6 @@ CONFIG_NSH_MMCSDMINOR=0
 #
 # I2C tool settings
 #
-CONFIG_I2CTOOL_BUILTIN=y
 CONFIG_I2CTOOL_MINBUS=1
 CONFIG_I2CTOOL_MAXBUS=3
 #CONFIG_I2CTOOL_MINADDR
@@ -774,7 +773,6 @@ CONFIG_EXAMPLES_USBSERIAL_TRACEINTERRUPTS=n
 #
 # Settings for examples/nx
 #
-CONFIG_EXAMPLES_NX_BUILTIN=y
 CONFIG_EXAMPLES_NX_VPLANE=0
 CONFIG_EXAMPLES_NX_DEVNO=0
 CONFIG_EXAMPLES_NX_BGCOLOR=0x0011
@@ -794,7 +792,6 @@ CONFIG_EXAMPLES_NX_EXTERNINIT=n
 #
 # Settings for examples/nxhello
 #
-CONFIG_EXAMPLES_NXHELLO_BUILTIN=y
 CONFIG_EXAMPLES_NXHELLO_VPLANE=0
 CONFIG_EXAMPLES_NXHELLO_DEVNO=0
 CONFIG_EXAMPLES_NXHELLO_BGCOLOR=0x0011
@@ -806,7 +803,6 @@ CONFIG_EXAMPLES_NXHELLO_EXTERNINIT=n
 #
 # Settings for examples/nximage
 #
-CONFIG_EXAMPLES_NXIMAGE_BUILTIN=y
 CONFIG_EXAMPLES_NXIMAGE_VPLANE=0
 CONFIG_EXAMPLES_NXIMAGE_DEVNO=0
 CONFIG_EXAMPLES_NXIMAGE_BPP=16
@@ -835,7 +831,6 @@ CONFIG_EXAMPLES_NXLINES_EXTERNINIT=n
 #
 # Settings for examples/touchscreen
 #
-CONFIG_EXAMPLES_TOUCHSCREEN_BUILTIN=n
 CONFIG_EXAMPLES_TOUCHSCREEN_MINOR=0
 CONFIG_EXAMPLES_TOUCHSCREEN_DEVPATH="/dev/input0"
 CONFIG_EXAMPLES_TOUCHSCREEN_NSAMPLES=25
@@ -843,7 +838,6 @@ CONFIG_EXAMPLES_TOUCHSCREEN_NSAMPLES=25
 #
 # Settings for examples/usbstorage
 #
-CONFIG_EXAMPLES_USBMSC_BUILTIN=y
 CONFIG_EXAMPLES_USBMSC_NLUNS=1
 CONFIG_EXAMPLES_USBMSC_DEVMINOR1=0
 CONFIG_EXAMPLES_USBMSC_DEVPATH1="/dev/mmcsd0"