uboot-phytec

MA-14916-1 adapt to the directory change of libavb

libavb is now under the directory of lib/, not lib/avb/ as before, to
adapt to this change, some modifications are made:
1. header file inclusion change, including parameter of -I option in
   Makefile
2. remove fsl_avb_sysdeps_uboot.c as the functions have been defined in
   avb_sysdeps_posix.c.

Change-Id: I4216e3ddb4e3e810783e4f46b953eda510c2627b
Signed-off-by: faqiang.zhu <faqiang.zhu@nxp.com>
Signed-off-by: Ji Luo <ji.luo@nxp.com>
(cherry pick from 58010b99560eea2027dd39909eb5b35404e6030e)