[QNN EP] Enable MaxPool Op with "auto_pad" param set as VALID. (#24752)
Enable MaxPool Op with "auto_pad" param set as VALID.
VALID runs with all pad values set to 0.
### Description
Remove the assert from QNN_EP for MaxPool Op with "auto_pad" as VALID
since the Op with this config is supported on QNN backend.
### Motivation and Context
QNN_EP rejects MaxPool Op with "auto_pad" as VALID with message the QNN Pool does not support this config.
QNN Pool Op supports auto_pad=VALID and all the pad values are set to 0.
Signed-off-by: quic-ankus <quic_ankus@quicinc.com>