ARM: dts: samsung: Remove unused samsung_k3pe0e000b

The only user of DTSI for Samsung K3PE0E000B memory was removed in
commit fa63d037 ("ARM: dts: omap5: Make uevm as the official board
and deprecate sevm support") so get rid of this DTSI as well.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>