ASoC: amd: renoir: Remove redundant assignment to pdm_ctrl and pdm_enable and pdm_dma_enable

Variable pdm_ctrl and pdm_enable and pdm_dma_enable are set to '0x00',
but they are overwritten later on, so these are redundant assignments
that can be removed.

Clean up the following clang-analyzer warning:

sound/soc/amd/renoir/acp3x-pdm-dma.c:148:2: warning: Value stored to
'pdm_dma_enable' is never read [clang-analyzer-deadcode.DeadStores].

sound/soc/amd/renoir/acp3x-pdm-dma.c:147:2: warning: Value stored to
'pdm_enable' is never read [clang-analyzer-deadcode.DeadStores].

sound/soc/amd/renoir/acp3x-pdm-dma.c:80:2: warning: Value stored to
'pdm_ctrl' is never read [clang-analyzer-deadcode.DeadStores].
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/1620298590-29749-1-git-send-email-jiapeng.chong@linux.alibaba.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/amd/renoir/acp3x-pdm-dma.c

@@ -77,7 +77,6 @@ static void enable_pdm_clock(void __iomem *acp_base)
 	u32 pdm_clk_enable, pdm_ctrl;
 
 	pdm_clk_enable = ACP_PDM_CLK_FREQ_MASK;
-	pdm_ctrl = 0x00;
 
 	rn_writel(pdm_clk_enable, acp_base + ACP_WOV_CLK_CTRL);
 	pdm_ctrl = rn_readl(acp_base + ACP_WOV_MISC_CTRL);
@@ -144,9 +143,6 @@ static int stop_pdm_dma(void __iomem *acp_base)
 	u32 pdm_enable, pdm_dma_enable;
 	int timeout;
 
-	pdm_enable = 0x00;
-	pdm_dma_enable  = 0x00;
-
 	pdm_enable = rn_readl(acp_base + ACP_WOV_PDM_ENABLE);
 	pdm_dma_enable = rn_readl(acp_base + ACP_WOV_PDM_DMA_ENABLE);
 	if (pdm_dma_enable & 0x01) {