dt-bindings: phy: qcom,snps-eusb2-repeater: Remove default tuning values

The reset default tuning value depends on the PMIC, so remove them from
the doc since they're not accurate for all PMICs.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Link: https://lore.kernel.org/r/20250617-eusb2-repeater-tuning-v2-1-ed6c484f18ee@fairphone.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>