test: lib: Use CONFIG_64BIT to detect 64 bit compile

Should use CONFIG_64BIT to detect a 64 bit compile and not
CONFIG_PHYS_64BIT. This allows more platforms to run the
full test code.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Andrew Goodbody <andrew.goodbody@linaro.org>
1 file changed