arm/km: introduce bootcount env variable and clean km_arm
This environment variable is used to set the bootcount address for the kernel. last_stage_init is not available for arm platforms. So the calls to set_km_var and set_bootcount_addr are done in misc_init_r. Additionally some unneeded printouts were removed. Signed-off-by: NValentin Longchamp <valentin.longchamp@keymile.com> Signed-off-by: NHolger Brunck <holger.brunck@keymile.com> Acked-by: NHeiko Schocher <hs@denx.de> cc: Wolfgang Denk <wd@denx.de> cc: Detlev Zundel <dzu@denx.de> cc: Prafulla Wadaskar <prafulla@marvell.com>
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