fix(ppp): Fix PPP not working after reboot if no RST

[me-no-dev]

Modem will try to switch to CMUX and then back to COMMAND in order to allow communication with the modem.

This does not work on SIM800, so RST pin should always be connected to ensure proper reset is possible on boot.

Fixes: #10237

[github-actions]

Warnings

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Generated by 🚫 dangerJS against b93d0e9

[github-actions]

Memory usage test (comparing PR against master branch)

The table below shows the summary of memory usage change (decrease - increase) in bytes and percentage for each target.

Memory	FLASH [bytes]		FLASH [%]		RAM [bytes]		RAM [%]
Target	DEC	INC	DEC	INC	DEC	INC	DEC	INC
ESP32S3	0	⚠️ +40	0.00	⚠️ +0.01	0	0	0.00	0.00
ESP32S2	0	⚠️ +32	0.00	⚠️ +0.01	0	0	0.00	0.00
ESP32C3	0	⚠️ +28	0.00	⚠️ +0.01	0	0	0.00	0.00
ESP32C6	0	⚠️ +26	0.00	⚠️ +0.01	0	0	0.00	0.00
ESP32H2	0	⚠️ +28	0.00	⚠️ +0.01	0	0	0.00	0.00
ESP32	0	⚠️ +32	0.00	⚠️ +0.01	0	0	0.00	0.00

Click to expand the detailed deltas report [usage change in BYTES]

Target	ESP32S3		ESP32S2		ESP32C3		ESP32C6		ESP32H2		ESP32
Example	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM
PPP/examples/PPP_Basic	⚠️ +32	0	⚠️ +32	0	⚠️ +26	0	⚠️ +26	0	⚠️ +28	0	⚠️ +32	0
PPP/examples/PPP_WIFI_BRIDGE	⚠️ +40	0	⚠️ +32	0	⚠️ +28	0	⚠️ +26	0	-	-	⚠️ +32	0

[github-actions]

Test Results

 56 files   -  83   56 suites   - 83   4m 53s ⏱️ - 1h 37m 52s
 21 tests  -   9   21 ✅  -   9  0 💤 ±0  0 ❌ ±0 
135 runs   - 168  135 ✅  - 168  0 💤 ±0  0 ❌ ±0 

Results for commit b93d0e9. ± Comparison against base commit 396def3.

This pull request removes 9 tests.

performance.coremark.test_coremark ‑ test_coremark
performance.fibonacci.test_fibonacci ‑ test_fibonacci
performance.psramspeed.test_psramspeed ‑ test_psramspeed
performance.ramspeed.test_ramspeed ‑ test_ramspeed
performance.superpi.test_superpi ‑ test_superpi
test_touch_errors
test_touch_interrtupt
test_touch_read
validation.periman.test_periman ‑ test_periman

♻️ This comment has been updated with latest results.

[szerwi]

I can confirm that the fix works for SIM7600E modem, so it resolves my issue.