uImage: use 'char *' instead of 'unsigned char *' for uImage_load()

This was only ever used on PPC, where they are equivalent and we
never saw the resulting -Wpointer-sign warnings.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Simon Horman <horms@verge.net.au>
3 files changed