Update qspi erase timeout value to 40s

Signed-off-by: Frank Li <Frank.Li@nxp.com>

uuu/qspi_burn_loader.lst

@@ -14,6 +14,6 @@ SDPS: boot -f _flexspi.bin -offset 0x1000
 FB: ucmd setenv fastboot_buffer ${loadaddr}
 FB: download -f _image
 FB: ucmd sf probe
-FB[-t 10000]: ucmd sf erase 0 100000
+FB[-t 40000]: ucmd sf erase 0 100000
 FB: ucmd sf write ${fastboot_buffer} 0 ${fastboot_bytes}
 FB: done
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