[PATCH v1] env: Fix compile error for envtools

[Jacky.Cao at sony.com]

>> Following error happens when build envtools for mx6qsabrelite.
>> 
>> $ make tools envtools
>>   UPD     include/generated/timestamp_autogenerated.h
>>   HOSTCC  tools/printinitialenv
>>   GENENV  u-boot-initial-env
>>   COPY    tools/version.h
>>   HOSTCC  tools/env/crc32.o
>>   HOSTCC  tools/env/ctype.o
>>   HOSTCC  tools/env/env_attr.o
>>   HOSTCC  tools/env/env_flags.o
>> In file included from ./arch/arm/include/asm/mach-imx/regs-lcdif.h:16,
>>                  from ./arch/arm/include/asm/arch/imx-regs.h:371,
>>                  from include/configs/mx6_common.h:21,
>>                  from include/configs/nitrogen6x.h:13,
>>                  from include/config.h:3,
>>                  from include/env.h:12,
>>                  from tools/env/../../env/flags.c:7,
>>                  from tools/env/env_flags.c:1:
>> ./arch/arm/include/asm/mach-imx/regs-common.h:51:9: error:
>> unknown type name 'uint8_t'
>
>"#include <linux/types.h>" was already in
>arch/arm/include/asm/mach-imx/regs-common.h
>
>Are u using an old tree?

I use master branch of OSS u-boot repo and meet the issue with
below commands:

make mx6qsabrelite_defconfig
make -j8
make tools envtools