clk: stm32mp1: Fix a memory leak in 'clk_stm32_register_gate_ops()'

We allocate some memory which is neither used, nor referenced by anything.
So axe it.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Gabriel Fernandez <gabriel.fernandez@st.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>