initvals: Add ar9462_2p1_pciephy_clkreq_disable_L1 for AR9462 2.1

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
initvals: Remove unused AR9462 2.0 arrays

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>