cmd: efi: ESRT table debug print

cmd: efi: ESRT table debug print

This commit enables the ESRT printing from the u-boot shell by invoking:
- efidebug capsule esrt

CC: Heinrich Schuchardt	<xypron.glpk@gmx.de>
CC: Sughosh Ganu <sughosh.ganu@linaro.org>
CC: AKASHI Takahiro <takahiro.akashi@linaro.org>
CC: Ilias Apalodimas <ilias.apalodimas@linaro.org>
CC: Andre Przywara <andre.przywara@arm.com>
CC: Alexander Graf <agraf@csgraf.de>
CC: nd@arm.com
Signed-off-by: Jose Marinho <jose.marinho@arm.com>
Reviwed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>