ARM: transform the EABI/OABI choice into a boolean
ARM: transform the EABI/OABI choice into a boolean

The CONFIG_ARM_OABI option is never used.

Signed-off-by: "Yann E. MORIN" <b375a36861a21dce61868a5a9b415811d17b4e97@anciens.enib.fr>
Cc: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>
Cc: Bernhard Reutner-Fischer <ce1ac9e9ad16abccd7821f371ad381197b4768ac@gmail.com>
Cc: Carmelo AMOROSO <532378793705a04edd56deb76ad8c0442834d55d@st.com>
Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

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