ARM: defconfig: Remove obsolete CONFIG_USB_EHCI_MSM

CONFIG_USB_EHCI_MSM was removed long time ago in v4.14-rc6
8b3f8630 ("usb: host: remove ehci-msm.c").

Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250829165031.110850-1-petr.vorel@gmail.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>