flash: use proper format with uint32_t

Modify the format strings to properly handle uint32_t data types.

Change the type of variable retval in 'nor/ambiqmicro.c' to match
both the value to carry and the returned type of the function.

Fix the prototype mismatch of function lpc2900_address2sector()
between the header and the C file.

Change-Id: I68ffba9bd83eec8132f83bff3af993861fd09d84
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5816
Tested-by: jenkins

src/flash/nor/sh_qspi.c

@@ -508,7 +508,7 @@ static int sh_qspi_write(struct flash_bank *bank, const uint8_t *buffer,
 	}
 
 	if (offset & 0xff) {
-		LOG_ERROR("sh_qspi_write_page: unaligned write address: %08x",
+		LOG_ERROR("sh_qspi_write_page: unaligned write address: %08" PRIx32,
 			  offset);
 		return ERROR_FAIL;
 	}