ARM: multi_v7_defconfig: Remove miphy365 phy Kconfig symbol.

This IP is only found on STiH415/6 silicon and support
for these SoCs is being removed from the kernel.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Cc: <kishon@ti.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>