Tolerate runtime service initialization failure
Tolerate runtime service initialization failure

At present, the firmware panics if a runtime service fails to
initialize. An earlier patch had implemented late binding for all
runtime service handlers.

With that in place, this patch allows the firmware to proceed even when
a service fails to initialize.

Change-Id: I6cf4de2cecea9719f4cd48272a77cf459b080d4e

mtk09422/arm-trusted-firmware,hzhuang1/arm-trusted-firmware,idl3r/arm-trusted-firmware,yatharth-arm/arm-trusted-firmware,idl3r/arm-trusted-firmware,Leo-Yan/arm-trusted-firmware,vchong/arm-trusted-firmware,davwan01/arm-trusted-firmware,robixnai/arm-trusted-firmware,sandrine-bailleux-arm/arm-trusted-firmware,jforissier/arm-trusted-firmware,sandrine-bailleux/arm-trusted-firmware,sandrine-bailleux-arm/arm-trusted-firmware,96boards/arm-trusted-firmware,ljerry/arm-trusted-firmware,jcastillo-arm/arm-trusted-firmware,yatharth-arm/arm-trusted-firmware,achingupta/arm-trusted-firmware,vchong/arm-trusted-firmware,athoelke/arm-trusted-firmware,sbranden/arm-trusted-firmware,longsleep/arm-trusted-firmware-pine64,vikramkanigiri/arm-trusted-firmware,lsigithub/arm-trusted-firmware_public,Leo-Yan/arm-trusted-firmware,96boards/arm-trusted-firmware,athoelke/arm-trusted-firmware,lsigithub/arm-trusted-firmware_public,jforissier/arm-trusted-firmware,hzhuang1/arm-trusted-firmware,davwan01/arm-trusted-firmware,robixnai/arm-trusted-firmware,jcastillo-arm/arm-trusted-firmware,ljerry/arm-trusted-firmware,mtk09422/arm-trusted-firmware,achingupta/arm-trusted-firmware,longsleep/arm-trusted-firmware-pine64,sandrine-bailleux/arm-trusted-firmware,sbranden/arm-trusted-firmware,vikramkanigiri/arm-trusted-firmware