feat(uart): fixes loopback function after IDF changes #4453

Job	Run time
Push event file	3s
Generate matrix	5s
Build (validation, esp32c6) / Build validation tests for esp32c6	4m 59s
Build (validation, esp32c3) / Build validation tests for esp32c3	4m 7s
Build (validation, esp32p4) / Build validation tests for esp32p4	4m 11s
Build (validation, esp32h2) / Build validation tests for esp32h2	3m 52s
Build (validation, esp32s2) / Build validation tests for esp32s2	5m 10s
Build (validation, esp32) / Build validation tests for esp32	5m 59s
Build (validation, esp32s3) / Build validation tests for esp32s3	6m 29s
Hardware	-1s
QEMU	-1s
	34m 53s

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