fix(rng): avoid clearing PMU_PERIF_I2C_RSTB in random disable API for C6

This configuration bit is required for ADC operation as well and hence
should not be cleared in the RNG API sequence.

Ideally, the ADC driver should take care of initializing this bit but
still the RNG layer change is required because of interleaved API usage
scenario described in following linked issue.

Closes espressif#14124
Closes espressif#14280

Author: mahavirj

components/bootloader_support/src/bootloader_random_esp32c6.c

@@ -88,9 +88,6 @@ void bootloader_random_disable(void)
     REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SARADC1_ENCAL_REF_ADDR, 0);
     REGI2C_WRITE_MASK(I2C_SAR_ADC, ADC_SARADC2_ENCAL_REF_ADDR, 0);
 
-    // Revert PMU_RF_PWC_REG to it's initial value
-    CLEAR_PERI_REG_MASK(PMU_RF_PWC_REG, PMU_PERIF_I2C_RSTB);
-
     // disable ADC_CTRL_CLK (SAR ADC function clock)
     REG_WRITE(PCR_SARADC_CLKM_CONF_REG, 0x00404000);