ARM: dts: imx6qdl: Specify IMX6QDL_CLK_IPG as "ipg" clock to SDMA

Since 25aaa75df1e6 SDMA driver uses clock rates of "ipg" and "ahb"
clock to determine if it needs to configure the IP block as operating
at 1:1 or 1:2 clock ratio (ACR bit in SDMAARM_CONFIG). Specifying both
clocks as IMX6QDL_CLK_SDMA results in driver incorrectly thinking that
ratio is 1:1 which results in broken SDMA funtionality(this at least
breaks RAVE SP serdev driver on RDU2). Fix the code to specify
IMX6QDL_CLK_IPG as "ipg" clock for SDMA, to avoid detecting incorrect
clock ratio.

Signed-off-by: Andrey Smirnov <[email protected]>
Reviewed-by: Lucas Stach <[email protected]>
Cc: Angus Ainslie (Purism) <[email protected]>
Cc: Chris Healy <[email protected]>
Cc: Lucas Stach <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: [email protected]
Cc: [email protected]
Tested-by: Adam Ford <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>

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