phy: qcom: sgmii-eth: vote for both voltage rails with correct current loads

The SerDes PHY has two voltage supply rails, vdda-0p9 and vdda-1p2,
that must both be enabled for calibration to succeed. Without them:

  qcom-dwmac-sgmii-phy 8909000.phy: QSERDES_COM_C_READY_STATUS timed-out
  qcom-ethqos 23040000.ethernet eth0: __stmmac_open: Serdes powerup failed

The driver relied solely on the PHY framework's implicit enable of
'phy-supply', which only voted for a single rail and set no current
load. Use devm_regulator_bulk_get_const() to acquire both supplies and
set the peak current loads (46 mA for vdda-0p9, 15 mA for vdda-1p2)
as required by the hardware.

Fixes: 601d06277007 ("phy: qcom: add the SGMII SerDes PHY driver")
Signed-off-by: Mohd Ayaan Anwar <mohd.anwar@oss.qualcomm.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Link: https://patch.msgid.link/20260804-b4-sgmiieth_serdes_regulator-v2-2-c4bc688177dd@oss.qualcomm.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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