README: fix misleading pointer to the defconf directory

			   with questions already answered.

			   Additionally updates the dependencies.

	"make defconfig"   Create a ./.config file by using the default

			   symbol values from arch/$ARCH/defconfig.

			   symbol values from either arch/$ARCH/defconfig

			   or arch/$ARCH/configs/${PLATFORM}_defconfig,

			   depending on the architecture.

	"make ${PLATFORM}_defconfig"

			  Create a ./.config file by using the default

			  symbol values from

			  arch/$ARCH/configs/${PLATFORM}_defconfig.

			  Use "make help" to get a list of all available

			  platforms of your architecture.

	"make allyesconfig"

			   Create a ./.config file by setting symbol

			   values to 'y' as much as possible.