dm: core: Require users of devres to include the header

At present devres.h is included in all files that include dm.h but few
make use of it. Also this pulls in linux/compat which adds several more
headers. Drop the automatic inclusion and require files to include devres
themselves. This provides a good indication of which files use devres.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Anatolij Gustschin <agust@denx.de>

drivers/serial/ns16550.c

@@ -13,6 +13,7 @@
 #include <reset.h>
 #include <serial.h>
 #include <watchdog.h>
+#include <linux/err.h>
 #include <linux/types.h>
 #include <asm/io.h>
 

drivers/serial/serial_mtk.c

@@ -15,6 +15,7 @@
 #include <watchdog.h>
 #include <asm/io.h>
 #include <asm/types.h>
+#include <linux/err.h>
 
 struct mtk_serial_regs {
 	u32 rbr;
@@ -454,4 +455,4 @@ static inline void _debug_uart_putc(int ch)
 
 DEBUG_UART_FUNCS
 
-#endif
+#endif

drivers/serial/serial_omap.c

@@ -12,6 +12,7 @@
 #include <ns16550.h>
 #include <serial.h>
 #include <clk.h>
+#include <linux/err.h>
 
 #ifndef CONFIG_SYS_NS16550_CLK
 #define CONFIG_SYS_NS16550_CLK  0

drivers/serial/serial_sifive.c

@@ -13,6 +13,7 @@
 #include <asm/io.h>
 #include <linux/compiler.h>
 #include <serial.h>
+#include <linux/err.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 

drivers/serial/serial_zynq.c

@@ -14,6 +14,7 @@
 #include <asm/io.h>
 #include <linux/compiler.h>
 #include <serial.h>
+#include <linux/err.h>
 
 DECLARE_GLOBAL_DATA_PTR;