imx: ahab: Fix compiler warnings in printf

arch/arm/mach-imx/imx8/ahab.c:110:63: warning: format ‘%x’ expects
argument of type ‘unsigned int’, but argument 2 has type ‘u64 {aka long
long unsigned int}’ [-Wformat=]

Fix those by using %llx

Signed-off-by: Oliver Graute <oliver.graute@kococonnector.com>
Cc: Stefano Babic <sbabic@denx.de>
Cc: uboot-imx <uboot-imx@nxp.com>