lib: xbc: Add cpu armv7 support

Fix compile error when ./make.sh rk3562-aarch32
lib/libxbc/libxbc.c: In function ‘isTrailerPresent’:
lib/libxbc/libxbc.c:49:21: error: cast to pointer from integer of

lib: xbc: Add cpu armv7 support

Fix compile error when ./make.sh rk3562-aarch32
lib/libxbc/libxbc.c: In function ‘isTrailerPresent’:
lib/libxbc/libxbc.c:49:21: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
return !strncmp((char*)(bootconfig_end_addr - BOOTCONFIG_MAGIC_SIZE),

Change-Id: I0e1e16533de9f1a03650014d43247f04772ffccf
Signed-off-by: Xuhui Lin <xuhui.lin@rock-chips.com>

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lib: add libxbc support

Pick from google U-Boot commit.

Signed-off-by: Joseph Chen <chenjh@rock-chips.com>
Change-Id: I5241db252789249cfc72b1017065c9e3ed3fc695