imx: hab: Fix usage of packed attribute

imx: hab: Fix usage of packed attribute

commit ed286bc80e9d ("imx: hab: Check if CSF is valid before authenticating
image") makes use of "__packed" as a prefix to the "struct hab_hdr"
declaration.

With my compiler "gcc version 7.2.1 20171011 (Linaro GCC 7.2-2017.11)" we
get:

./arch/arm/include/asm/mach-imx/hab.h:42:25: error: expected ‘=’, ‘,’, ‘;’,
‘asm’ or ‘__attribute__’ before ‘{’ token
 struct __packed hab_hdr {

Fix this problem by including <linux/compiler.h>

Signed-off-by: Bryan O'Donoghue <[email protected]>
Cc: Utkarsh Gupta <[email protected]>
Cc: Breno Lima <[email protected]>
Cc: Fabio Estevam <[email protected]>
Reviewed-by: Fabio Estevam <[email protected]>