clk: nxp: Remove an unused field in struct lpc18xx_pll

In "struct lpc18xx_pll", the 'lock' field is unused.
Remove it.

Found with cppcheck, unusedStructMember.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/6cfb0e5251c3a59a156e70bcf6a0cc74aa764faa.1711985490.git.christophe.jaillet@wanadoo.frAcked-by: Vladimir Zapolskiy <vz@mleia.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

drivers/clk/nxp/clk-lpc18xx-cgu.c

@@ -250,7 +250,6 @@ static struct lpc18xx_cgu_base_clk lpc18xx_cgu_base_clks[] = {
 struct lpc18xx_pll {
 	struct		clk_hw hw;
 	void __iomem	*reg;
-	spinlock_t	*lock;
 	u8		flags;
 };