Since commit 83a86fbb ("irqchip/gic: Loudly complain about
the use of IRQ_TYPE_NONE"), a warning is raised if IRQ_TYPE_NONE is used.
So we use IRQ_TYPE_LEVEL_HIGH for usart nodes instead of IRQ_TYPE_NONE.
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>
Tested-by: Fabrice Gasnier <fabrice.gasnier@st.com>