fix ext4_write_file can only write file once

Wavin de1653267893 at
Sat Feb 18 16:44:41 CET 2023

Hi!     I found an problem that the u-boot will delete my file first when I write an exists file on ext4 filesystem. This results in only one line being written when I want to write multiple lines, and cannot write more times. Although the method maybe betrickly, It's really resolve my problem.

Thanks & Best Regards!
Wavin Don
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